Buggy code:
public final class AsciiString implements CharSequence , Comparable < CharSequence > { public static final AsciiString EMPTY_STRING = new AsciiString ( "" ) ; private static final char MAX_CHAR_VALUE = 255 ; public static final int INDEX_NOT_FOUND = - 1 ; private final byte [ ] value ; private final int offset ; private final int length ; private int hash ; private String string ; public AsciiString ( byte [ ] value ) { } public AsciiString ( byte [ ] value , boolean copy ) { } public AsciiString ( byte [ ] value , int start , int length , boolean copy ) { } public AsciiString ( ByteBuffer value ) { } public AsciiString ( ByteBuffer value , boolean copy ) { } public AsciiString ( ByteBuffer value , int start , int length , boolean copy ) { } public AsciiString ( char [ ] value ) { } public AsciiString ( char [ ] value , int start , int length ) { } public AsciiString ( char [ ] value , Charset charset ) { } public AsciiString ( char [ ] value , Charset charset , int start , int length ) { } public AsciiString ( CharSequence value ) { } public AsciiString ( CharSequence value , int start , int length ) { } public AsciiString ( CharSequence value , Charset charset ) { } public AsciiString ( CharSequence value , Charset charset , int start , int length ) { } public int forEachByte ( ByteProcessor visitor ) throws Exception { } public int forEachByte ( int index , int length , ByteProcessor visitor ) throws Exception { } private int forEachByte0 ( int index , int length , ByteProcessor visitor ) throws Exception { } public int forEachByteDesc ( ByteProcessor visitor ) throws Exception { } public int forEachByteDesc ( int index , int length , ByteProcessor visitor ) throws Exception { } private int forEachByteDesc0 ( int index , int length , ByteProcessor visitor ) throws Exception { } public byte byteAt ( int index ) { } public boolean isEmpty ( ) { } @ Override public int length ( ) { } public void arrayChanged ( ) { } public byte [ ] array ( ) { } public int arrayOffset ( ) { } public boolean isEntireArrayUsed ( ) { } public byte [ ] toByteArray ( ) { } public byte [ ] toByteArray ( int start , int end ) { } public void copy ( int srcIdx , byte [ ] dst , int dstIdx , int length ) { } @ Override public char charAt ( int index ) { } public boolean contains ( CharSequence cs ) { } @ Override public int compareTo ( CharSequence string ) { } public AsciiString concat ( CharSequence string ) { } public boolean endsWith ( CharSequence suffix ) { } public boolean contentEqualsIgnoreCase ( CharSequence string ) { if ( ( string == null ) || ( ( string . length ( ) ) != ( length ( ) ) ) ) { return false ; } if ( ( string . getClass ( ) ) == ( AsciiString . class ) ) { AsciiString rhs = ( ( AsciiString ) ( string ) ) ; for ( int i = arrayOffset ( ) , j = rhs . arrayOffset ( ) ; i < ( length ( ) ) ; ++ i , ++ j ) { <START_BUG> if ( ! ( AsciiString . equalsIgnoreCase ( value [ i ] , value [ j ] ) ) ) { <END_BUG> return false ; } } return true ; } for ( int i = arrayOffset ( ) , j = 0 ; i < ( length ( ) ) ; ++ i , ++ j ) { if ( ! ( AsciiString . equalsIgnoreCase ( AsciiString . b2c ( value [ i ] ) , string . charAt ( j ) ) ) ) { return false ; } } return true ; } public char [ ] toCharArray ( ) { } public char [ ] toCharArray ( int start , int end ) { } public void copy ( int srcIdx , char [ ] dst , int dstIdx , int length ) { } public AsciiString subSequence ( int start ) { } @ Override public AsciiString subSequence ( int start , int end ) { } public AsciiString subSequence ( int start , int end , boolean copy ) { } public int indexOf ( CharSequence string ) { } public int indexOf ( CharSequence subString , int start ) { } public int lastIndexOf ( CharSequence string ) { } public int lastIndexOf ( CharSequence subString , int start ) { } public boolean regionMatches ( int thisStart , CharSequence string , int start , int length ) { } public boolean regionMatches ( boolean ignoreCase , int thisStart , CharSequence string , int start , int length ) { } public AsciiString replace ( char oldChar , char newChar ) { } public boolean startsWith ( CharSequence prefix ) { } public boolean startsWith ( CharSequence prefix , int start ) { } public AsciiString toLowerCase ( ) { } public AsciiString toUpperCase ( ) { } public AsciiString trim ( ) { } public boolean contentEquals ( CharSequence a ) { } public boolean matches ( String expr ) { } public AsciiString [ ] split ( String expr , int max ) { } public AsciiString [ ] split ( char delim ) { } @ Override public int hashCode ( ) { } @ Override public boolean equals ( Object obj ) { } @ Override public String toString ( ) { } public String toString ( int start ) { } public String toString ( int start , int end ) { } public boolean parseBoolean ( ) { }

Fix:
if ( ! ( AsciiString . equalsIgnoreCase ( value [ i ] , rhs . value [ j ] ) ) ) {